Cutting instrument.



W. P. ROBERTSON. cumus INSTRUMENT.

APPLICATION FILED APR. l5. i915.

1,287,754. I Patented Dec.17, 1918.

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WILLIAM R Ronnnmson, on NEW YORK, N. Y.

CUTTING INSTRUMENT.

Be it.known that I, WILLIAMP. ROBERT- SON, a citizen of the'United States, and. a resident Ofthe city 'of New York, borough of Manhattan, county and .State' of New York, have invented a new and Improved Cutting Instrument,- of'which the following is a specification.

-. inventlon relates generally cutting the cuttlng blades and their-operative con- Jnect1ons.

instruments having two or more pivotally connected cutting blades. 1 It is particularly applicable to cutting instruments adapted .to performj"comparativelyyheavy work. Onegpoi th i tt tmyr inventlm} is provide "a; cutting instrument h in: wh ch at least one of the shearing oncutting "blades ttin s ts" 1 gitudinal movement fbetween. coacting blades, as the instrument is bperatedp emerge th t the Another'object of my inventionis to provide, oi cutting instrument ()OIIIPIISlIIg tWO fcooperating blade members pivotally con-- 'nected together, so constructed and arranged that there will bev a relative longitudinal gnovement of one of theblademembers rearwardly toward. the, handles so that the material being sheared will be forced or drawn toward the angle formed by the two cutting 'noth 'er object of my invention is to pro- .vide a cutting instrument having a pair of outer'pivotally-connected blades and having a blade provided with irregular or scalloped cutting edges on opposite sidesthereof located between saidouter blades, the irregularorf scalloped edges cooperating with the." cutting edges of the. co-acting outer ,blades'f" 1 v 1 Another object is to-provide a cutting intrument having a pair of outer .pivotallyconnected blades and a cutting. blade located between them; lthe instrument being 'so con 'e will be. a relativelongi- .tudi naljnovement between, the central blade and each' it)? the outer blades, as the instru- .ment is operated.

Otherand further obiects' of Inv-invention will-clearly appear from the detailed description toiollow. i

. showin spep fiel embefil t fof he invention reference is made to the drawing shownin Fig 5; and

forming apart of this specification, in whlch drawing,

- Specification of Letters Patent. te t 17, 1913 Application filed April 15, 1915. Serial No. 21,597.

, Figure 1 shows in plan a pair of hedge L trimmers or shears embodying the invent1on. In said figure-the full lines show the shears .in open position, while the dotted lines indicate the position of the various partswhen the shears are closed.

Fig. 2' is a side elevation of a portion of ,Fig." 3 is anfenlarged plan view showing tingblades when inclosed position:

outer blades and the ,intermediate'blade Fig. 7 shows a-portion of another-"mod? fied form of the lowerend ofthe intermediate blade and its operative connections.

The outerblade members Aand B are pivotally connected together bv the ,bolt 'or pivot Tln C. Theseouter blade members A and B comorisetheblade proper It and b and the handle portion or stem a 7). upon .whichare driven or'otherwise fixedly secured the handles properD and E. The shears also comprise anintermediateblade F, upon the opposite edges of which,

namely. along the ed es G and H, are the irregular or scalloped cutting portions which coon raterespectively with the cutting edges 7M and L.

'In the embodiment of mv in ention illustrated in Fi 1. this interme te blade is slottedas at N. to receivethe fillenpiece or memb ro' -'adarted to slide freelv in the slot N; .The' filler-niece 0 is perforated so astonerinit the bolt or: pivot Din to pass therethroiiizh. T e intermediate blade Fcis also provided with a rearwardlv eittending portion 0. 'This rearwardlv ex endinn 1 0i tion O is ;'oivotallv connected through the medium of tbe l nksPand to the handle portions a and b respectivelv'. the link being connectedto ex ension 0 by the bolt or'pivot oin K and to the handle portion a Fig. 5shows'a portion oit aniodifie'dform 'of theintermediatecutting blade.

Fig. 6' shows a'portion of, he connecting -means between the handle portion of the" by the bolt or pivot pin S, and the link Q being connected to extension 0 by the bolt 0r pivot pin K and to the handle portionfb' by the bolt or pivot pin T.

As shown in Fig. 1, it is apparent that as the blades A and B are caused toapproach the intermediate blade F, the links P and Q will cause the intermediate blade tosimultaneously move. longitudinally relativeillustrated, the outer blades Aand B are provided with regular or' straight cutting edges L and'QM' respectively, While the intermediate. blade F is provided with irregula r or scalloped cutting edges G and It will be noted that as the outer bladesAand B approach the intermediate blade .F,.the latter is forced longitudinally rearwardly, so that the pieces" of material"v being sheared willt'end to; be forced toward the" angle formed by: the/"cutting edgesand thus prevented froiii slippingforwardly ,tdjw'ard the free ends of the outtingbladesl Moreover, the rearward movement of i the intermediate blade coacting with the outer blades; will give a draw'lor shearing out, which is a highlydesirable feature in instruments of this kind.

. Two modified forms of my invention are shown in Figs. 5, 6 and 7. In these two forms the intermediate blade 1 does not have the longitudinal movement rea'rwardly relative tof'the cooperating outer blades, but the -intermediate blade is maintained in its cenrrarpusaion by the link construction indicated in Figs. 6' and 7. Y ,iWith the form of intermediate blade' F shown in Figs. 5 and 6, instead of the slot provide a perforation W to receive the bolt or pivot pin C. The rearward extension 0 is provided with a slot f adapted to receive a suitable filler piece through which passes a connecting of pivot pin X which likewise secures the links P and Q. to the eXtensionO. H

As shown in Fig. 7, instead of slotting "the rearward e'\ftens;io'n' O of the intermediate' blade, provide a collar" adap'ted'to slide" Qve1{ therearward extending portion 0 and; havingpivotally connected to it the links-Rand Q, t I

embodiments of. my invention shown Figs. 5, 6 and 7 the links described cbnnectionwith the intermediate blade serve merely to maintain the intermediate blade central position relative to the outer blades; whereas,;m the form, OfLm'y invention shown in Fig. 1, the links serve not only this function, but they also serve as a part of the mechanism which causes the intermediate blade to move rearwardly relative to the cooperating outer blades.

It will readilybe seen that either cutting blade at or I) may be dispensed with and the blade F have either a regular or irregular cutting edge, as desired, which will cooperate with the cutting edge ofthe retained outer blade, so that when the cutting blades are forced toward each other the blade F will move longitudinally rearwardly toward the ivotal connection.

The improvements herein set forth are not limited to the precise constructions. and arrangements shown and. described, asthey may be embodied in various forms andmodifications without departing from the spirit and scope of the invention.

. What I claim is: a 1. A cutting instrument of the scribed, comprising, two outer 7 blade members ea'ch' of which provided with I a handlemember, an intermediate blade member having a" slot therein located between said outer members being'connect'ed.byaacomm rm ivot 4 and-links pi votally connected" to -tlie d or the intermediate blade outer blade members.

lass deblade embers all of aid" b'ladethe handle membersfiofj said 2; A cutting instrument of the class' d escribed lmvi-ng onter'blade memb rs'and an intermediate blade member, all of which-are a common pivot pin,

the intermediate bl'ad vided" with a amatmw' n whic'hi the pivot pinfpasses' and also having" scalloped or: tionson; its opposite'jedges, one of which scalloped portions cobpera'te's' with the cuttin'gi' portion of one of the outer blade menv bers and the other scalloped port'ioneniip crates with thecutting edge portion of the ther outerbla'de m mber, and links conn ct ingthe handle portions of said outer blade members with the rearward intermediate" blade m mber; l

3. A cutting instrument of the class de scribed, comprising a pair of outer blade members andan intermediate blade member,

portion of the all of which are connected together by a common pivot pin, the intermediate blade member having scalloped cuttingedges-on opposite edges thereof one of which scat loped cutting edge coo erates with the cutting edge of and the other scalloped-cutting edge 006perates. with the cutting. ed "e of the other outer blade member, the in ermediate blade member having a closed slot; within which one of the outer blade members operates a slide piecethrough which passes 1 the common pivot pin, and meansic'omprising two links pivoted to the rearward end of said intermediate blade membe s, the

other ends of said links being pivoted re- This specification signed and witnessed ipegtively tp) the handle portions of the (auter this 14th day of April, A. D. 1915. a e mem ers to cause tle interme iate blade member to move rearwardly or longi- WILLIAM ROBERTSON 5 tudinally With respect to the outer blade Signed in the presence ofmembers as said outer blade members ap- M. C. MARGESON, proach each other. G. MCGRANN.

Copies of this patent may be obtained; for five cents each, by addressing the Commissioner of Patents, Washington, D. G." 

